Gear-cutting machine.



PATENTED JAN. 29, 1907.

J. E. GLEASON.

GEAR OUTTING` MACHINE.

'APPLIOATION PILD 11Bo.z7,19o4.

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Witnesses.

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NO. 842.455; PATBNTBD JAN. z, 1907.

J. E. -GLEAs0N- GBAR GUTTI'NG nzLxmflIlsIB.`

APPLICATION E'ILED DEO.27,1904.

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THE mmm; f'srsRs co., wAsmNcmN. D. c

No. 842,455. PATBNTED JAN. 29, 1907. J. 3.- GLBAsoN. GBAR OUTTING MAGHINE. APPLICATION I'ILEI) DBO.2'7,1904.

No. 842,455. PATENTED JAN. 29, 1907.

J. E. GLEASON.

GEAR CUTTING MACHINE.

APPLICATION I'ILD DEO.27,1904. v

5 7 SHEETS-SHEET 6.

` Witnes'ses.

a Attorey UNITED STATEF'PENT OFFIOE.

JAMEs EL GLEAsON, OF ROoHEsTER, NEw YORK, AssiGNoR To THE GLEAsON woRKs, OF ROoHEsTER, NEW YORK, A CORPORATION OF NEW YORK.

GEAR-'CUTTING MACHINE.

Specification of Letters Patent.

Fatentea Jan. 29, 1 907.

Application fil'ed December 27, 1904. Serial No. 238.350.

T0 all whom it nuty concer'n:

Be it known that I, JAMEs E. GLEAsON, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Gear-Cutting Machines; and I do hereby declare the and expeditiously generating the teeth of the gears by a series of successive Operations which are rendered automatic by the use of the Operating devices that form a part of my invention.

To these and other ends the invention consists in certain improvements and combinations and arrangements ofparts, that will be hereinafter more fully described, the novel features being pointed out particularly in the 1 claims at the end of the specification.

In the drawings, Figuro 1 is a side elevation of a device of this Character constructed Fig. 2 is a plan view of the same.

Operating devices forthe gear-blank and the contiguous parts in section. Fig. 4 is adetail 'vi ew of the change-gearin'gifor the blankoperating device, showing them detached from the machine. Fig. 5 is a detail view of the stop mechanism for controlling the operation of the blank-Operating devices. Fig. 6

is a transverse sectional view on the line 6 6 of Fig. 1 looking in the direction of the arrow, parts being broken away and omitted. 7 is a agmentary end view of the machine looking from the right in Figs. 1 and 2, parts being omitted. Fig. 8 is a detail sectional view showing the Operating devices for the gear-blank and the stop mechanism for controlling the operation thereof. Fig. 9 is an enlarged view of'the-worm-wheel and its operating-worm, 'which serve to connect the `change-gearing with the arbor supporting the gear-blank. `Fig. 10 is an end elcvation with. the supporting-base and contiguous Fig. 3 is a fragmentary view, on an enlarged scale, showing the Fig.

parts in section, showing the Operating devices for the tools and related parts. Fig. 1] is a fragmentary plan view of the carrier and.

`supporting-base with parts thereofomitted,

showing the cam-controlled devices for feeding the tools. Fig. 12 is a sectional plan view through the supporting-base with parts omitted, showing the mechanism for setting into operation the blank-Operating devices. Fig. 13 is a sectional view on the line 13 13 of Fig. 11, showing the Operating mechanism for shifting the plane of motion of the tools. Fig. 14 is a sectional view on the line 14 14 of Fig. 1.3, showing the driving means for the tool-Operating devices. Figs. 15 and 16 are detail views of a device which may be employed for shifting the tool-Operating devices in a circular path around the supportin base. Fig. 17 is an elcvation of the too s and their supports. Fig. 18 is a transverse sectional view on the line 18 18` of Fig. 17, showing the method of mounting the toolsupporting devices. Fig. 19 is a detail sectional view on the section 19 19 of Fig. 17, showing the method employed in the present instance for looking the tool to its holder. Figs. 20 and 21 are detail views in elcvation and plan, respectively, showing the construction of the tool-holders and the method in which they are mounted. Fig. 22 shows the Operating mech ynism for shifting the directions of motion of he tools in a manner that will be hereinafter described, the supporting-base being shown in section and parts of the device being broken away or omitted; and Fig. 23 is a sectional view on the line'23 23 of Fig. 11, showing the operating connections between the cam and the turret. Fig. 24 is an enlarged view`showin T the Operating mechanism which is employed for transmitting motion between the toolbor; and Fig. 25 is a diagrammatic view vshowing the manner in which the tools operate upon the blank to generate the teeth therefor, the successive positions of the tools and the blank being indicated in dotted lines. Similar parts are designated by the same numerals of reference in the several views.

My inventionin its present form embodies a machine which is particularly adapted for use in forming the teeth on bevel-gears,- wlnch renders the operatlon expeditlous and at the same time enables the peculiar form of ated and uniformly cut.

tooth which is necessary for the proper operation of bevel-gears to be accurately gener- Such a machine embodies generally a supporting base 1, which is provided with the rectilinear ways 2 to receive the longitudinally-movable frame 3, and at the opposite end of the base is provided the horizontal supporting-surface 4 to receive the rotatable turret or carrier 5, the latter being provided with a cylindrical extension 6, which enters a correspondinglyshaped Chamber 7 of the supportingbase and forms an axis about which the carrier rotates as a center. concentrically with the chamber 7 are formed the segmental guideways 8 and 9, respectively, which are arranged exteriorly of the base and support the rotatable frame 10 in such a manner that it is capable of being shifted around the supportinOf-base in anarc concentric with the cylindrical axis 6 of the carrier 5, an antifrictionroller 11 being preferably provided to bear upon the u per side of the segmental rack 1,2 to reduce t ie friction, caused by the shifting motion of the carrier, a bracket 13 being preferably formed on the latter and provided with a revoluble spindle 14, the lower end of which carries a pinion 15, which coperates with the rack 12, the upper end of the spindle being provided with a ratchet 16, with which coperates the reversible pawl 17, which is carried by the operating-handle 18, the latter being revolubly fitted over the spindle and capable of being manipulated manually to rotate the spindle 14 through the coperation of the ratchet 16 and pawl 17, a springoperated stop 19 being provided for retaining the pawl 17 in locled position, such a construction permitting the frame 10 to be readily shifted into any desired position upon the su pporting-base, and through its connections with the tool-carrier the latter may be adjusted to correspohd with the pitch-cones of the gears to be generated.

In the supporting-base is provided a bearmg 20, in which is revolubly fitted the main driving-shaft 21, the latter being provided upon its outer end with an ordinary pulley or other power-transmitting device 22, and upon its inner end is provided a bevel-gear 23, which meshes with a corresponding gear 24, which is fixed upon the Vertical shaft 25, the latter being mounted concentrically of the extension 6 and provided at its upper end with the bevel-gear 26, and also meshing with the Orear 24 is a corresponding gear 27, which is ixed upon the shaft 28. The latter is mounted in a bearing 29, which is fixed to the movable frame 10 and capable of swinging radially about the shaft 25 as an axis, the connection between this shaft and the bevelgear 24 being such that it may receive motion continuously irrespective of the position of the said frame relatively to the supporting-base, and upon the outer end of the shaft 28 is provided the gear 30, which. meshes with a corresponding gear 31, which is fixed upon the shaft 32, the latter being also mounted upon the movable frame 10 and provided with a worm 33, which meshes With a Wormwheel 34, which is fixed to the transverselyarranged Stud-shaft 35, the latter being revolubly mounted in a bearing 36, which is also fixed to the frame 10, and this shaft 35 carries upon its opposite end a pinion 37, which is arranged to coperate with a bevel-gear 38, which is fixed to the Vertical Stud-shaft 39, the latter being supported upon a bearin bracket 40, which is fixed to the movab e frame 10.

Fitting loosely over the extended portion 35a of the Stud-shaft 35 is mounted a sleeve 41, to which is connected a crank 42, carrying at its outer end a stop 43 for the purpose that 'will be hereinafter described, a guideway 44 being preferably provided on an arm movable with the crank 42 and adapted to receive a crank-pin 45, which serves to adjustably connect the crank with the connectingrod 46. Mounted on the rotatable sleeve 41 is a clutch member 47, which is connected to the said sleeve by the spline 48, which perniits a relative longitudinal motion of the said member upon the sleeve and operates to transmit a rotary motion between the parts, and adjacent to this clutch member 47 is a corresponding member 49, the latter being fixed rigidly to the wheel 34. With the clutch member 47` co erates an vOperating member 50, 'which is xed to the shaft 51, 'which is capable of a relativelyl longitudinal motion, one end thereof being arranged to coperate with the stop 43 of the crank 42 when it is shifted in one direction to arrest the rotation of the crank 42, and upon its other end is provided a projection 52.

On the upper end of the Stud-shaft 39 is fixed a cam 53, which carries upon its periphery the spiral cam 54, which is arranged to coperate with the prcjection 52 on the longitudinally-movable shaft 51 to shift the latter at predetermined intervals, such an operation serving to disengage the stop 43 from the adiacent end of the said shaft and to engage the respective clutch members 47 and 48 to cause the rotary motion of the wheel 34 to be transmitted to the crank 42, and when the said shaft is shifted in the opposite direction, under the action of a suitable spring 51a, Fig. 11, after the disengagement of the projection 52 thereon from the cam 54, the clutch members 47 and 48 will be disengaged and the stop 43 'will coperate with the adj acent end of the said shaft to arrest the motion of the crank.

On the upper face of the wheel 38 is providedv a stop cr projection 55, which is arranged to coperate with a corresponding member 56, which is carried .upon a longitudinally-movable rod 57, the latter being op- IIO IIS

erated in one direction by thespring 58 and in the opposite direction by the coperative engagement of thestop 55 and the member 56 during the rotation of the wheel 38, the stop 55 disengaging from the member 56 when the rod 57 has been operated a predetermined distance, by reason of the fact that this stop moves in a circular path about the shaft 39 as a center, as will be obvious in referring to Fig. 12, and upon this rod 57 is mounted a pawl 59, which is arranged to cooperate with the ratchet-wheel 60. This wheel 60 is mounted in the bracket 61, which is fixed to the movable frame 10, and it carries a pinion 62, which coperates with the hsegmental rack 63, which is formed on an arc struck from the center of motion of the frame 10 and is capable of being shifted circularly around the supporting-base, the connection between the pawl 59 and the ratchet 62 being of such a nature that the motion may be transmitted between these parts irrespective of the relative position 'of the movable frame 10 on the su' porting-.base, one end of this movable racl 63 being connected by the link 64 With a crank 65 on the rock-shaft 66, so that oscillatory motion may be imparted to the latter by the relative motion of the rack, a spring 67 being employed for returning the rack to its normal position subsequently to the operation thereof by the stop 55 and its connections.

On the upper face of the cam 53 is provided a cam-slot 68, (see Fig. 11,) which is adapted to receive an Operating roller or projection 69, the latter being connected to the swiveled support 70, which is pivotally mounted upon the bracket 71 of the movable frame 10 at the point a, and adjacent to this support 70 is arranged the Operatingarm 72, which is rigidly connected to the rotatable turret or carrier 5, a radially-arranged slot being providedin the said arm to receive a cross-head 73, which is operatively connected to the sup ort 70 and is capable of being adjusted longitudinally in the slot of thearm 72 by the adjusting-screw 74, the construction being such that by manipulation of the screw 74 the cross-head 73 may be.

so positioned in the slot of the arm 72 that the angle of motion, which is transmitted from the cam-slot 68 through the support 70 to the Operating-arm 72 may be varied within the desired limits, so that the carrier 5 may rotate through a given angle.

The operative connection between the toolcarrier and the frame 10, embodying the toolfeeding cam 53 carried by the latter, the pivoted support 70, having the Operating projection 69 coperating with the cam, and the cross-head 7 3,0peratively connecting the support 70 and the radial arm 72 on the carrier, serves not only to impart the necessary horizontal swinging movement to the carrier to 65 feed the tools toward and from the blank, but

the connection above described also serves to shift the tool-carrier to bring' the tools into operative position corresp onding to the pitchcones of the gears when the frame 10 is rotated about the base of the machine, so that adjustment of one of these parts effects ad-` j ustment of the other.

To the connecting-rod 46, which is operated by the crank 42, is connected the cross-head 75, which is fiXed to the vertically-movable guide 76, the latter being slidingly mounted in upper and lower bearings 77 and 78, respectively, the said guide 76 and its supporting-bearings being both movable with the frame 10, and the connection of the crosshead thereof With the crank 42 through the connecting-rod '46 will cause the rotary motion of the crank to impart a verticallyreciprocatory motion to the cross-head 75.

The longitudinally-movable frame 3, which is capable of being moved on the supportingbase in a direction radially of the turret'or carrier 5, is provided with a nut 79, which coperates with the operating-screw 80, the said nut being fixed to the said frame by means of bolts 81 and the securing-screws 82, and upon this frame are mounted the bearingstandards 83, in which is revolubly-mounted a sleeve 84, which is provided with a spline or feather 85, and within this sleeve is revolubly mounted the arbor 86. Upon one end of the sleeve 84 is attached the arm 87, and upon the adjacent end of the arbor 86 is fixed a 88, an adjusting-screw 95 being provided between the said arm and the supporting-plate for the purpose of adjusting these parts and. looking them in relative adj usted position.

On the spindle 90 is mounted an Operatingstem 96, which is rigidly attached thereto, and fixed to this stem is a clutch member 97, which is arranged to coperate with the corresponding clutch member 98, which is loosely' mounted on this stem and fixed to a pinion 99, a clamping-head 100 being threaded upon the stem 96 and arranged to operate upon the relatively movable clamping member 98 toengage and disengage it from its corresponding clutch member 97, which is fixed to the stem. This construction enables the pinion 99 to be. temporarily disconnected from the stem 96 and its connected parts, so that the latter may be rotated or adjusted in any desired position, manipulation of the clampingl head 100 serving to lock the pinion infiXed r`elation to the stem 96 and the spindle 90.

XCO

IIO

With the pinion 99 are adapted to mesh the change-gears, which are carried by the swiveled support 101, the construction of the latter being such as to accommodate gears in various combinations and of different dimensions, and for this purpose this support is pivoted on the shaft 102, which is mounted in the bearing-brackets 103 of the supportingplate 92, and it is provided with a segmental slot 104, which coperates with a clampingbolt 105, which is carried by a relatively fixed part of the adjacent bearing 103, and upon the lower end of this bracket is provided a radial slot 106, with which coperates the Stud-shaft 107 which serves as a bearing for the change-gears 108, which mesh, respectively with the pinion 99 of the spindle 90 and with the gear 109, which is fixed to the shaft 102. This construction enables the changegears 108 to be brought accurately into mesh with the gear 109 by adjusting the studshaft 107 within the slot 106, and the corresponding change-gear may be brought into accurate mesh with the pinion 99 and secured in such a relation by the clamping-screw 105, which is fixed to the bearing-bracket 103 and coperates with the segmental slot 104.

To the shaft 102 is fixed a cam 110, with which coperates the projection 111 of the pivoted arm 112, the cam being provided with an incline in its periphery, which is so located that it will engage theprojection 111 at a predetermined point in its rotation, and as the projection 1].1 of the arm 112 is held yieldingly in engagement with the periphery of the cam by the action of the spring 113 the action of the projection 111 will normally tend to rotate the cam to a predetermined position while it is on the incline thereof, as shown in Fig. 5. Fixed to the cam 110 and rotating therewith is a disk 114, which is provided with a notch 115 in its periphery, the latter being arranged to coperate with a movable stop 116, which is carried by the guide 116/ and which occupies a relatively fixed position, the relative positions of the notch 115 and the incline in the periphery of the cam 110, which coperates with the projection 111, being such that when the disk 1 14 is permitted to rotate by the disengagement of the stop 116 and the notch 115 the rotary motion will continue until the notch reaches the stop, and at this time the projection 111 will be on the incline of the cam and under the action of the spring 113 and will insure the complete rotation of the disk 114 until the notch 115 therein is in proper engagement with the stop 116. p

The shaft 102 carries upon one end a bevelgear 117, which is rigidly fixed thereto and arranged to mesh with the bevel-gear 118, which is mounted upon a radial bearing-arm 119, the inner end of the latter being journaled upon the sleeve 120, which is fitted over the reduced portions 121 of the shafts 102 and 122, the outer end of this arm being fixed to the casing 123. These shafts are mounted at their adj acent ends within the hollow, casing 123 and are arranged in alinement, the inner end of the shaft 122 having fixed thereto a bevel-gear 124, which corresponds with the gear 117 of the shaft 102 and meshes with the pinion 118.

On the periphery of the casing 123 are formed the teeth 125, which are arranged to mesh with the worm 126, the latter being mounted on the Stud-shaft 127, which is journaled in the bearing 128 in alinement with thesleeve 84 and arbor 86 and carries at its outer end a bevel-gear 129. This bevel-gear meshes with the corresponding gear 130,'

fixed to the upper end of the inclined shaft 131, which is mounted in the bearings 132 and 133, respectively, the lower end of the shaft carrying a bevel-gear 134, which meshes with the correspondinggear 135 of the longitudinal shaft 136, this gear 135 being journaled in a bracket 137, which is movable with the frame 3 and is provided with a key 138, which coperates with a longitudinal keyway 139 in the shaft 136, so that the rotary motion of the latter may be transmitted to the shaft 131 through these bevel-gears irrespective of the relative longitudinal position of the frame 3. This longitudinal shaft 136 is mounted in the bearings 140 and carried upon its opposite end the bevel-gear 141, which meshes with a corresponding gear 142, which is fixed to the main driving-shaft 21.

On the shaft 122 is fixed a stop-wheel 143, the periphery of which is preferably roughened or serrated, and adjacent to the periphery of this wheel is mounted the movable stop 144, which is capable of being moved vertically in its support 145, so as to engage and disengage the periphery of the wheel 143, so as to control its motion. The stop 144 and the stop 116 are operatively connected by the pivoted link 146, so that these stops will operate in unison, but in opposite directions, a spring 147 being arranged to bear upon this link in such a manner as to normally retain the stop 116 in engagement with the notch 115 in the periphery of the disk 114. The lower end of the stop 144 is provided with an inclined surface 148, which is arranged to cooperate with the projection 149, whlch is carried by the pivoted arm 150, and adj acent to this arm 150 is mounted the rock-shaft 66, which is provided with a longitudinal keyway 66a to receive a key 151, which serves to connect the said shaft with an arm 152, the latter being arranged between the bearingbracket 153 and the support 154, so that it may be moved longitudinally along the rockshaft 66 by the corresponding motion of the frame 3, and it will still be capable of receiving the rotary motion thereof. This arm 152 is provided with a roller or projection' 155, which is arranged to coperate with the IOO IlO

swinging arm 150 to elevate and depress it, and as the projection 1'49 coperates with the stop 144 while the parts are in the relative positions indicated in Fig. 7 it will be obvious that the rocking motion of the shaft 66 will cause the arm 1-52 to raise the arm 150, and through the projeotion 149 it will move the stop 144 into engagement with the periphery of'the wheel 143, and through the link 146 it will simultaneously disengage the stop 116 from the peripheral notch 1 15 of the disk 114, and as motion is transmitted from the worm 126 to the casing 123 it will be obvious that while the wheel 143 is held locked by the step 144 the shaft 102, carrying the disk 114, the cam 110, and the gear 109, will be free 'to rotate by reason of the fact that the stop 116 at this time is disengaged from the notch 115, and as this shaft 102 continues to rotate the motion thereof will be transmitted from the wheel 109 to the chan e-gears 108 and to the pinion 99, and from t e pinion 99 it will be transmitted through the stem 96 and the lspindle 90 through the worm 89, to the wormwheel 88, and. as this worm-wheel 88 is fixed to the arbor 86 a rotary motion will be imparted to the latter, which will cause the gearblank, which is carried upon the o p posite end thereof, to be rotated through a predeter-A mined angle. This motion will continue un- `til the notch 115 reaches the stop 116, when the latter will be moved upwardly under the action of the spring 147 to arrest the rotation of the disk 114, and simultaneously the stop 144 will be disengaged from the periphery of the wheel 143, causing the motion whichis continuously imparted to the be transmitted to the shaft 122.

Over the sleeve 84 is fitted a sleeve 156, which is capable of a relative longitudinal motion thereon and is provided with a keyway 157, which coperates with the key or spline 85 of the sleeve 84, so that rotary motion may be transmitted between the parts irrespective of their relative longitudinal positions, and to this sleeve 156 is attached a radially-arranged arm 158, whichis provided with a segmental gear 159, which is formed thereon 'concentrically with the sleeve 84. Coperating with this segmental gear 159 is a rack 160, which ismounted to reciprocate vertioally on the guideways 161, the latter being carried by a relatively fiXed frame 162, attached to the supporting-base, and upon opposite sides of this rack are provided the trunnions 163, which are arranged in alinement with the pitoh-line of the rack, and on these trunnions are journaled the cross-heads 164, which are capable of reciprocating within the guideways 165, which are formed radially within the arms 166, the latter being rigidly attached to one end of the segmental casing 123 to mental arm 167 is pivotally supported by the bearing-arm 168, which is rigidly supported by the bracket 169, fixed to the supportingbase of the machine, the bearing 168 ,being arranged accurately in alinement with the arbor 86. e

On the turret or carrier 5 is provided a bracket 170, which is'provided at one end with a journal 171 for supporting the revoluble shaft 172, and this shaft carries the adjustable Crank-disk 173, which is provided with the radial slot 174 to receive the radiallyadjustable crank-pin 175, to which the pitman or connecting-rod v17 6 is secured by the clamp 177, the opposite end of this shaft 172 carrying a sprocket-wheel 178 to receive a power transmitting chain 179, which is driven by the sprocket 180, the latterbeing fixed to the gear 181, which is driven by the pinion 182, the shaft 183, which carries the pinion 182, being journaled in a bearing 184, which is preferably formed integrally with the cyindrical extension 6 of the turret or carrier, a bevel-gear 185, which meshes with the corresponding gear 26 of the Vertical shaft 25, serving` to transmit motion from the latter to the crank-disk 173.

In the bracket 170 of the rotatable carrier 5 is provided a bearing 186, which eXtends in a direction radially ofl the center of motion of the carrier, and in this bearing is fitted a'studshaft 187, which is provided with a head 1,88, and between the head 188 and the side of the bracket 17 0 are pivotally mounted the bearings 189 and 190, which are attached to their respective guideways 191 and 192, the latter being supported at their free ends by the support or bracket 193, which has its coperating surface formed on` an arc struck from the shaft 187 as a center to receive the correspondingly-shaped ends of the guideways, so

as to permit the latter to be adjusted relatively to each other about their common center, and for this purpose the turnbuckle 194 may be employed for moving the guideways relatively to each. other and the locking-bolts 193a for looking them in adjusted position;

In the ways of the guides 191 and 192 are mounted lthe longitudinally-movable toolholders 195 and 195, respectively, which are connected to the pitman or connecting rod 176 in any suitable manner that may enable these tool-holders to be reciprocated in their respective guideways at divergent angles with the bearing 186 as a center, about which thetool-holders may swing radially, the adjusting device 194 when operatedl serving to vary the relative angle through which these tool-holders operate. These tool-holders may be of any suitable construction, those shown embodying a guiding block 196, which is formed to extend entirely through a longitudinal slot in its corresponding guideway and to engage the opposite surfaces thereof, and it is provided with a compensating wedge 197, which is arranged to engage one of the walls within the slot of the guideway to take up any looseness which may occur, a screw 198 being employed for adjusting it, and eX- tending through the guiding-block is a bolt 199, over which a sleeve 200 is fitted, having one end arranged to engage beneath the bolthead, and the other bears uponthe upper surface of a block 201, which is pivoted to swing laterally about the pivot 201a, said block being so iitted in the guiding-block as to move in a relatively lateral direction to enable the tool to engage and disengage from the work on the forward and return strokes, and this block 201 is provided with a socket to receive the opposite end 199aL of the clamping-screw 199, which is forked or yoke-shaped to receive the jaws 202. These jaws are compressible and are formed to receive the operating-tool 205, the cutting-surface of which is usually formed at approximately an angle of fifteen degrees, or, in lother words, to correspond to the angle of action of the gear-tooth which is to be cut. These jaws 202, which are adapted to receive the tool, are provided with relatively inclined sides to correspond with the oppositely-inclined surfaces which are formed within the yoked poriion 199CL of the bolt 199, such a construction obviously causing the clamping-jaws 202 to be compressed against the sides of the tool when the clamping-screw 199 is tightened.

In order to enable the tools to be properly positioned, it is preferable to form .these jaws with their upper faces inclined forwardl y to coperate with the correspondingly-inclined surface of the removable block 201, so that as they are each moved forward] y within their respective tool-holders they will be adj usted toward one another, and in order to insure the proper positioning of these jaws while being set in their holders it is preferable to provide an adjustable stop 205% which serves to limit the forward motion of the iaws, the tool 205 being movable longitudinally within the jaws while the clamping-bolt 199 is loosened. The sleeve 200, which is interposed between the block 201 and the head of the clamping-screw, operates to prevent relative motion taking place laterally between the guiding-block 196 and the block 201, while the requisite pressure may be produced upon lthe clamping-jaws 202 by the action of the yoke portion 199a of the clamping-bolt. The arc-shaped bracket 193, which supports the adjustable ends of the guideways 191 and 192, is provided with a projection 206, which is slidable laterally within a corresponding channel in the block 207, the latter being provided at its under surface with a supporting-plate 208, which is preferably adjustable relatively thereto and arranged to coperate with the cross-head 75, which is reciproeated vertically by the crank 42 and the rod 46, the block 207 being provided with a lateral projection 209 and block 209, which is capable of traversing the curved channel 210, which is formed upon the inner surface of the segmental arm 167 concentrically with the center of motion of the turret or carriers.

In setting up the machine for cutting the teeth of bevel-gears the blank for the latter arbor 86, and the change-gears 108 are arranged in such a combination with the pinion 99 and the gear 109 that the angle of rotation of the blank at each successive operation may be predetermined so that the desired number of teeth may be cut thereon, and the turret or carrier 5 is rotated on the supporting-base, so that the tools which are carried by the guideways 191 and 192 may be brought in proximity to the periphery of the gear, and this accomplished by rotating the frame 10, which is supported on the segmental guides 8 and 9 around the supporting-base by manipulation of the handle 18, which is connected, through the ratchet 16 and the pawl 17, to the shaft 14, rotation of the latter causing the pinion thereon to traverse the segme'ntal rack 12, which occup'ies a relatively fixed position on the base, the gear 27 remaining in mesh with the corresponding gear 24, so that motion may be transmitted to the operating-shaft 28 from the main driving-shaft 21. At the same time the angle of motion through which the tools operate is adjusted by manipulation of the device 194, which serves to vary the distance between the free ends of the guideways 191 and 192, the relative motion taking place about the shaft 187 as a center, and in order that the angle of motion through which the turret or tool-carrier 5 rotates may be so adjusted that operation of the latter through the cam 68 will cause the'tools to move inwardly to the proper depth the angle of motion of the tool-carrier may be adjusted by the screw 74, which operates upon the crosshead 7 3, which is movable radially in a slot in the arm. 72, so that the requisite angle of motion imparted thereto from the cam may be obtained. The frame 3, which. is movable radially of the carrier 5, may now be moved inwardly by the screw 80 to bring the gearblank into operative position.

Assuming that the tool-carrier is in such a position that the tools thereon are out of engagement with the blank and that the latter -has been rotated into the initial operative position, the first operation will be caused by the cam 68, which is rotated in the indicated direction by the gears 37 and 38, which in turn are rotated by the wheel 34, meshing with the worm 33, and the latter is mounted on the shaft 32, which is connected by the gears 30 and 31' and to the Operatingshaft 28, the latter being connected through i the gears 23,24, and 27 to the main operatis suitably secured to the inner end of the i IOO IIO

ing-shaft 21. As the roller or projection 69 of the swiveled support-70 rides in the camslot 68 of the cam while the latter is operatting in the direction indicated by the arrow,

gear-blank, operating about the center` of motion of the carrier which intersects the i aXis of rotation of the gear-blank. While these tools are moving in this direction they are beingreciprocated continuously within their guideways by the rotation of the crank 173, the latter being connected by the sprocket-wheels 178 180 and sprocket-chain 179 and through the gears 181 and 182, shaft 183, gears 185 and 26 to the Vertical shaft 25,

which is driven from the driving-shaft 21 through the gears 23 and 24. The feeding of the tools into the gear-blank while the segmental arm 167 occupies a relatively central Vertical position will continue until the tools have reached the total-depth of the tooth, and at this time the cam 54 on the periphery of the cam 53 will engage the projection '1,52

' on the longitudinally-movable shaft 51,

causing the latter to be shifted to disengage from the stop 43 ,and simultaneously connect the clutch members 47 and 48, and this will cause thel crank 42 to be rotated by the operation of the wheel 34. This crank 42 normally occupies the position shown in Fig. 22 while the segmental arm. 167 is in its central position; but when it is set into motion it first moves downwardly, Operating upon the cross-head 75 to lower thesegmental armuntil it reaches a predeternined position, andthen it will begin to rise until it passes its central position and is moved through a corresponding angleabove its central position, the motion of the crank continuing until this segmental arm and the tools are returned to their normal central position, as indicated in Fig. 22, the operation of the crank 42 being interrupted by the disengagement of the cam 54 and the projection 52, 'which permits the shaft 51 toreturn un- 'der the action of the spring 51a, attached to the clutch-yoke 50, thereby discngaging the clutch members 47 and 48 and coperating with the stop 43 tov arrest the motion of the crank.

During the swinging motion of the tools through the operation of the arm 167 a simultaneous rotary motion in the same direction is imparted to the gear-blank by the arms 166, which are attached thereto and receive a corresponding motion, and the cross-heads 164, which are movable radially within the i guideways 165 therein and are journaled on sleeve 84 through the key 85 the arm'87, at-

tached thereto, will be oscillated. As the spindle 90, carrying the worm 89, is carried by this arm 87, the oscillatory motion of the |arm 87 will be transmitted to the Wormwheel 88, which meshes with the worm 89, and from the worm-wheel 88 the motion will be transmitted to the arbor 86, upon which the gear-blank is fixed, causing the latterto be rotated simultaneouvsly and in the same direction as the swinging motion which is imparted to the Operating-tools. This rotary motion of the gear-blank should be uniform with the simultaneous swinging motion of the Operating-tools, as the latter operate as a tooth of the proper form would coperate with the corresponding teeth of the gear when completed, and during their swinging motion they generate the teeth of the blank, and to secure this result in a machine of this character which is universally adjustable to accommodate gear-blanks from which gears having pitch-cones vof different angles are formed I employ in the present instance the motion-transmitting devices between the tools and the gear-blank which cmbody the coperatively-arranged rack and segmental gear 160 and 159, respectively, the former being mounted to reciprocate vertically within its guideways and having an operative connection with the radial extensions of the segmental arm 167, so that the swinging motion of the latter may be transmitted to lthe vertically-movable rack, and as this rack meshes with. the segmental gear 159, which is carried by the radial arm 158, the latter being connected to the supporting-arbor for the gear-blank, the swinging motion of the arm 167 will impart a corresponding rotary motion to the gear-blank, the speed of which will accelerate as the angle of the swinging arm relatively to its central position increases. However, swinging motion is imparted to the arm 167 through the block 209?L and projection 209 of the support 207, the latter Operating in a given plane about the supporting-sh aft 187 of the tool-supports,

.and it is obvious that with the turret or carrier occupying various angular positions relatively to the axis of the gear-blank the motionwhich is imparted to theoperating-tools through the support 207 during the operation of the crank 42 will cause a swinging motion to be imparted to the arm 167 through. the roller or projection 209 but the angle of motion of 'the arm 167 will not correspond precisely with the angle i through insuring a substantially uniform motion of cones thereof may vary within considerable which the tools operate, for it will be obvious l that the Operating-block 209a and projection 209 will shift their position relatively to the arm 167, which will tend to decrease the angle through which the arm moves while the tools are swinging through a given angle.

As the rack and segmental gear connection between the arm 167 and the arbor for the gear-blank is designed to impart an accelerating motion to the gear-blank while the arm 167 is Operating through a given angle, it will beunderstood that the diminishing angle through which the said arm moves as it leaves its normal central position will be compensated for by the accelerating angle of rotation of the gear-blank, thereby the gearblank and the Operating-tools to render an accurate generation of the gearteeth, even though the angles of the pitchdegrees. This operation of simultaneously rotating the gear-blank and swinging the operating-tools in the plane about the pivot 187 as a center first occurs in a downward direction immediately after the Operatingtools have been fed into the blank the depth of the tooth and have approximately formed the two opposite faces of the latter, and as the swinging motion of the blank and the operating-tool progresses the lower point of the upper tool will begin to cut the curve for the fiank of the adjacent tooth-surface, the rotation of the blank as it progresses causing the tooth which is being operated upon to be gradually drawn away from the Operatingtool for the reason that the tools at this time are swinging about the pivot 187 as a center, while the teeth of the blank are moving in a plane at an angle to the plane of motion of the tool and are being swung radially about the arbor 86 as an aXis.

As the simultaneous swinging of the blank and of the tools in their respective planes progresses and the edge of the upper tool is gradually leaving the flank of the tool and traversing the adjacent side thereof the cutting edge of the opposite tool is at the same time Operating to cut away the metal on the proper contour for the face at the opposite side of the tooth, this swinging motion of the blank and Operating-tools in one direction completing `the operation of forming the face of one side and the flank at the opposite side of a tooth. The Operating-Crank 42 at the moment the swinging motion in one direction is completed will occupyits lowerrnost position, a continued rotation thereof causing it to rise, and thereby elevate the rocking arm 167, passing the central position of the latter, at which point the Operating-tools were fed radially into the periphery of the blank to approximately form the sides of the tooth, and as the tools continue upwardly the lower tool will begin to operate upon the adj acent fiank of the tooth in a manner similar to that describing the operation of the upper tool in forming the corresponding opposite surface of the tooth, the cutting-surface of the upper tool at the same time operatlng upon the adjacent face or tip of the tooth to properly shape it as the tooth swings away from the tool in a circular path, and when this operation has been completed both faces' of the tooth have been correctly formed by their respective tools, continued operation of the crank 42 bringing the tools, and consequently the arm 167, into its normal central position, as shown in Figs. 1, 6, and 17. When the blank and the tools have both reached the relatively central position, the cam 68 will operate upon the arm 72 to retract the turret or carrier 5, and thereby remove the tools from operative position, relatively to the tooth of the gear-blank which has just been formed. When the tools have been completely withdrawn, the stop 55, which rotates with the gear 38, and the cam- 68 will have reached such a position as to engage the projection 56, which is carried by the longitudinally-movable rod 57, causing the latter to be reciprocated, and this will move the pawl 59 into engagement with the ratchet-wheel 60, causing the latter to be rotated, and thereby through the pinion 62 to impart a circular motion to therack 63, and as the rock-shaft 66 is connected to the rack 63 by the rod 64 and crank 65 a rotary motion will be imparted to the rock-shaft, which will cause the arm 152 to coperate with the arm 150 to cause the projection 149 thereon to elevate the stop 144. This will bring the stop 144 into engagement with the periphery of the wheel 143, arresting the rotation thereof, and simultaneously causing the stop 116 to be lowered and disengaged from the notch 115 in the periphery of the disk 114, the motion of the stop 144 being transmitted to the stop 1 16V through the pivotal connection 146.

As rotary motion is continuously imparted to the casing 123 through the worm 126 and rotation of the wheel 143 at this time is prevented by the stop 144, it Will be obvious that the motion of the casing 123 will be trans- `mitted to the shaft 102 through the pinion 118, which is carried 'by the casing and coperates with the gear 124 of the shaft 122 and the corresponding gear 117 of the shaft 102, and as the gear 118 is held in fixed relation relatively to the casing the motion will be imparted to the gear 117 of the shaft 102 at an increased speed. To the shaft 102 is fiXed the gear 109, which operates the changegears 108, and through the pinion 99 motion is imparted to the spindle 90, to which is fiXed the worm 89, which coperates with the worm-wheel 88, and from the latter rotary motion is imparted to the arbor 86, causing a corresponding rotation of the gear-blank which is fixed thereto. The angle through IOC IIO

' ber of teeth which are to be cut.

I which the gear-blank is rotated at each successive operation of the mechanism just described will be so adjusted by the changegears 108 as to divide the periphery or surface of the blank into the proper'number of spaces, which will be determined by the num- V This mechanism just described for rotating the geari blanlr will continue to operate until the peripheral notch 115of the disk 1 14 reaches the stop 116,whe'n it will be engaged by the latter, and as the stop 116 moves into the notch 115 under the action of the spring 147 bearing on the link 146, Fig. 7, the stop 144 will simultaneously disengage from the wheel 1437 permitting the latter to resume its motion, the projection 111 at this time coperating with the inclined surface of the cam 110 to insure the complete rotation of the disk 114, so that the notchv 115 therein will remain in fixed engagement with the stop 116, the projection 111 Operating under the action of thespring 113.

'After each successive operation of the blank-operating mechanism the gear-blank will be centered in position to receive the op'- erating-tools for cutting the next tooth, and

these tools are brought into operative position through the operation of the cam 68,

which operates upon the arm 72 through the member 70 to rotate the turret or carrier 5 in a manner that has been hereinbefore depletely rotated and the opposite faces of each tooth have been operated upon respectively by the upper and lower Operating-tools.

In order to accommodate blanks of different diameters, it is preferable to employ the longitudinally-movable frame 3, which carries the `arbor 86 and also the Operating mechanism for rotating the blanlr, the rockshaft 66 and the operating-shaft 136 being provided with longifudinal keyways or other suitable devices with which their respective parts coperate, so that the frame 3 maybe shifted longitudinally to any desired position, while the rotary motion of these shafts will be transmitted'to their respective parts without interruption, and for this reason the key or spline 85 is formed' upon the sleeve 84 and arranged to coperate with`the sleeve 156, so that rotary motion may be transmitted to the latter from the sleeve 84 irrespective of the various positions which the longitudi- 'nally-movable frame 3 may occupy. The segmental arm '167 is also employed in the present instance because it enables the plane of action of the Operating-tools to be adjusted so as to 'correspond to the various angles of the pitch-cones of 'different gears which are to be formed, and as the center of motion of the tools and carrier will coincide With the apeX of each gear'tobe formed the correct i l7 4, which is carried by the support 70, is also preferably em' loyed, for it enables the depth to whic the tools are fed into the blank to'be readily adjusted, so that it may correspond to the depth of the gear-tooth which is to be formed, the adjustment being effected through variations in the angles through which the carrieri operates. Of course in Operating upon gears of differing diameters t e Operating-tools should be adjusted in range of the tooth by manipulation of the clamping device 177, which connects the pi-tman 176 with the crank-pin 175, and the distance through which the tools reciprocate should be likewise adjusted according to circumstances by varying the throw of the crank 173 by adjusting the position of the pin 175 thereon.

A machine constructed in accordance with my invention is capable of' accurately forming the' teeth of bevel-gears by the peculiar construction and arrangement of the various devices whereby the blank is pro erl brought into operative position, andp the tools are fed forwardly into the blank, and while the tools and the blank ``are in coperative relation the tools and the blank are simultaneously swung upon their respective axes, the relative motion of the tools and the blank being such as to form proper contours uponthe faces of the teeth7 the successive Operations of rotating the blank, feeding the tools, swnging the tools and the blank in the relation described, and retracting the tools being performed automatically through the operation of their respective Operating `devices. Moreover, the principle .of rotating the blank in a plane about its geometrical IOO axis and im arting a simultaneous swinging'` motion to t e Operating-tools about a point 'o which is coincident lwith the apex of the pitch-cone of the gear being formed insures the correct generation of the teeth, andby the use of the Operating devices hereinbefore described for manipulating the gear-blank and the Operating-tools which are arranged to coperate therewith the formation of the gears is rendered expeditious, and lthe machine is automatic in its operation.

I claim as my'invention- 1. In a machine for generating bevelgears, the combination with suitable supports for the gear-blank and the o, eratingtool, said supports being capable o relative angular adjustment to accommodate gears having itchvcones of different angles, of means -or swinging the gear-blank on its axis and simultaneously Operating the tool in a path tangential to the gear-blank, and

means for automatically pro ortioning the relative s eed of movement o the pitch-surface of t e gear-blank and the coperating toolaccording tol the angular relation of the planes in which they operate to generate the curves of the gearteeth by evolution.

2. Ina machine for generating the curves on the working faces of bevel-gear teeth, the combination with a support for centering a gear-blank on its aXis, and a tool-support adapted to guide a tool to operate in a path tangential to the pitch-surface of the gear to be generated, the blank and tool supports being capable of adjustment for operation in different angular relations to accommodate gears having pitch-cones of different angles, of means for simultaneously swinging the vblanl and tool supports in their respective paths with an equal Velocity of movement of thepitch-surface of the blanlr and the coperating tool, the generatingmovements of the tool and blank being proportioned automatvically at all relative angular adjustments of the blank and tool supports. p

3. .In a machine for generating bevelgears, the combination with a support for rotatably centering a gear-blank on itsaXis, .and .a tool-support mounted to swing on an axis. and adapted to guide an Operating-too?` in.a path'tangential to the pitch-surfac'e of the `gear to be generated, the aXes of the blank and tool supports being capable of an- ,gular adjustment to accommodate gears having pitch-cones of different angles, of means for simultaneously swinging the blank andtool supports in their respective paths, and .devices for automatically proportioning the, swinging moticns of the blanlr and the w tool-,in ratios varying according to the angular relation of the paths in which the blank` and tool operate to maintain equal Velocity of motion of the pitch-surface of the blank and the coperating tool.

4. In a machine for generating the teeth of bevel-gears, the combination with the supports for the gear-blank and Operating-tool, ,said supports being mounted to swing in planes .in different angular relations to accommodate gears having pitch-cones of different angles, of means for simultaneouslv swinging the supports through predetermined relative angles, and means for automatically, proportioning the relative swinging movements of the blank and tool according to the angular adjustments of the su ports to produce an equal Velocity of tie tool and the pitch-surface of the gear being generated.

5. In a machine for generating the teeth of bevel-gears, the combination with the supports for the gear-blank and Operating-tool, said supports being mounted to swing in paths arranged in different angular relations ;to correspond with gears having pitchcones ofI different angles, of meansV coperating withithe said supports at all positions of relativeadjustment thereof for automatic- ,allyj proportioning the relative swinging motion of the supports to cause an equal velocity of the tool and the pitch-cone of the gear to be generated, irrespective of the angular relation of the planes in which the tool and and a tool-support mounted on an aXis carried by the turret and adapted to guide an Operating-tool in a path tangential to ythe pitch-surface of the gear to be generated,of an arm mounted to swing on an axis coinci- (lent with the aXis of the gear-blank and having ways therein formed concentrically withV the axis of the turret, and operativeconnections between the said arm and thefigearblank and Operating-tool for imparting equal velocity of movement of the pitch-surface of the blank and the coperating tool.

7. In a machine for cutting bevel-gears, the combination with awork-support for centering the gear-blank on a given aXis, and a tool capable of Operating in planes at variable angles relatively to the plane of rotation of the blanl, of devices interposed between the blank land the tool for' automatically pro-V ducing equal speed of motion on the pitchsurface of the blanl: and the tool in their respective planes irrespective of the relative angular relation of the tool.

8. In a machine for cutting bevel-gears, the combination with awork-support for centering the gear-blank-0n a given axis7 and a tool mounted to move -in a plane which is perpendicular to the plane of rotation of the blank, and which is also capable of swinginfir in different planes transversely to the sai perpendicular plane, of means for feeding the tool in a direction transversely of the conesurface7 and devices for imparting a simultaneous swinging motion to the blank and the tool in their respective planes.

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9. In a machine for cutting bevel-gears,

the combination with awork-support for cenltering the gear-blanl: on a given' axis, and a tool mounted to operate about a point c,oin-'.

cident with the axis of the blank and ar-y ranged to swing in a predeter'mined plane about a given aXis, of feed devices for moving the tool into engagement with the -blank about the said point as a center, and means for simultaneously swinging the blank and the tool about their respective axes.

10. In a machine for generating the teeth of bevel-gears, the combination witha support for centering a gear-blank o n a givenaxis, of a-turret mounted to Swing in a plane:v substantially parallel to the axis of the blank for accommcdating gears of different conev angles, a tool-support mounted on the turret and having a tool arranged to swing in planes tangential to the pitch-cone of the gear being generated, means for swinving the` said turret on its axis to feed the too to the blank, and

'means 'for simultaneously swinging the blanl:

and tool-support on their respective aXes after the tool has been fed to the blank and 'the combination with awork-supportfor centering a gear-blankon a given axis, and a turret oarrying a tool mounted to operate in a given plane about a point coincident with the aXis of the blank and havingan aXis` about which the tool is capable of swinging in ia 1plane perpendicular to the plane of motion of the turret, of feed devices for moving the turret in a plane about the said point as a center to feed the tool toward the blank, and means for simultaneously swinging the blank and 'the tool about their respective aXes.

12. In a machine for generating bevelgears, the oombination with a support for centering a gear-blank so as to rotate on its aXis, of a turret mounted to rotate on an aXis in angular arrangement to that of the blank and adjustable to accomniodate gear-blanks of different pitch-cones, a tool-support pivotally'mounted on the turret and adapted to carry a tool arranged to swing in a path tangential to the pitch-surface 'of the blank,

means for rotating the turret on itsv a'Xis to feed the tool toward the blank, and means for simultaneously swinging the blank and the tool on their respective axes and means forV .automatically proportioning the .generating moveme'nt to cause van e ual Velocity of movement of the 'tool and flhe pitoh-surface of the blank in generating bevel-gears having i pitch-cones of different angles.

13. In a machine for generating bevelgears, the combination with a support for 'centerin a gear-blank on its axis, of a turret mounte to rotate in a plane substantially parallel to the' aXis of the blank, a tool-support mounted to swing on 'said turret in different planes corresponding to the pitoh-cones of thegears to be generated, a frame adjustablejconcentrically about the aXis of movement of the turret, means 'mounted on said frame and coperating with the turret for fee'ding the tool carried therebv` into and out ofM coperative relation with the blank, and

` i, means for simultaneously swinging the blank and tool on their respective aXes after the tool has been fed into coperative relation with the blank for, generating thecurves of the teeth thereof. i

14.' In a machine for generating bevelgears, the combination with a support for centering a gear-blank on its aXis, of a turret mounted on an axis arranged transverse to i l that of the blank, a toolsupport pivotally mounted on the turret` and arranged to swing in different planes corresponding to the pitch-` cones of the gears to be generated, and an operating-arm mounted to swing concentrically with the aXis of the gear-blank and having an operative connection with the tool-support for producing simultaneous swinging movement of the blank and the tool on theirrespective axes for generating the curves of the gear-teeth.

15. In a machine for cutting bevel-gears,

the combination with a work-support for centering a gear-blank on a given aXis, and a tool-support carrying a tool which is arranged i to move in different planes relatively to the,

16. In a machine for generating the working faces of bevel-gear teeth, the combination with a support for centering a gear-blank `on its axis, and a tool-support adapted to guide a tool to move in a path tangential to the pitch-surface of the gear, the aXes of rota- 'tion ofthe blank and tool being capable of -relative angular adjustment to provide for gears having pitch-cones of different angles, of motion -transmitting devices operatively connected to the blank and tool while the aXes thereof are arranged in different angular adjustments for imparting simultaneous swinging movement to the blank andtool in ratios corresponding with the different angular adjustments of `their aX'es. i 17. In a machine for generating bevelgears, the combination with a support for rotatably centering a gear-blank on its axis, a turret mounted to swing on a verticalaxis for altering the plane of operation of the tool according toA the different pitch-angles of the gears to be generated and a tool-support mounted on the turret and arranged to guide an Operating-tool in a path tangential to the pitch-surface of the gear, of a segmental arm having ways thereon formed concentrically with the Vertical aXis of the turret, a projection on the tool-support coperating with said ways for operatively connecting 'said arm and the tool-support at all positions of adjustment of the turret about its axis, said' arm being mounted to swing about the aXis of the gear-blank and devices interposed between said arm and the gear-blank for causing a uniform motion of the pitch-surface of the blank and the tool to generate the curves of the gear-teeth.

18. In a machine for cuttingbevel-gears, the combination With a' work-support for centering a gear-blank 'on a given axis, and a tool-support carrying a tool mounted to move in a plane about an aXis which is arranged inangular relation to that of the blank, `of an arm movable in a to thatvof the gear-blank and operatively connected to the tool-support, a correspond- IOO IIO

plane parallel i v tively to 'the aXis of the blank, of an arm'op-.

erativelyzconnected to the' tool-support and`|- support mounted on the carrier and arranged mounted to rotate about anaxis which-is i-n ing member operatively connected -to..-'thesupportifor the gear-blank, and devices -in-'\ terposed-between the said arm and the `said member connected to the gear-blank support Vfor causing. a uniform motion of the 'blank and the tool about their respective'axes.

19. In a machine for cutting bevel-gears,l the' combination with a support for centering a gear-blanlr-on a given axis, and a tool-sup-:f port .carrying a tool and mounted to move-.in a plane about an axis arranged angularlyrelamounted to'swing about theaXis of the blank as-a center, a corresponding memberoperativelytconnected to the support. for the gear+1 blank, and a rack-and-gear` connectionbetween the said arms for causinga uniform motion of'the blank and the tool about=their respective aXes.

20. Inxa machine' for cutting .bevel-.gearsy the: combination -with a supportforming an. axis aboutwhich a gear-blank is adapted 'to' rotate, .and a tool-support carrying'a .toolangularrrelation to that of'theablankyand a predetermined angle to the'axisof the blank, of 'an armformed concentrically= withf the* aXis ofzthe tool-support and mountedtoop-z crateaboutthe aXis of the blank asacen'ter;M said arm .being operatively connected: totthe' tool while the'latter occupies different'positions around its aXis, and devices :operativelyf connecting the said arm and the' gear-blank for causing a uniform motion of the tool and' the blank on their respective aXes.

21. In'a machine for cutting=bevel-gears,' the-combination with a work-supportforcentering a gear-blank on a givenl aXis, a tool-= carrier-.mounted to`rotate about an axisar-` gear-blank and the tool-support 'about'their'w respectiveaxes.

22. In a machine for cutting bevel-gearavthe combination with a work-support vfor centering a gear-blank on a given axis, fatoolcarriermounted to rotate about an. aXis ar-` ranged'in angular relation tozthat of 'the'gearblank,=and a tool-support mounted. on thes` carrier and-.arranged tol swing in a planem transversely'to the plane'of rotation=of then:

carrier.,-of an arm formed concentrically with'z` the aXis of the carrier and mountedzto .rotate about the aXis. of the gear-blanki said armbeing operatively connected withithe' tool-supportya second arm operativelyi'connected: to the'` gear-blank i support and a rack-and-gear connection between the said armsfor causing a uniform motionof. the' gear-blank andv the tool whilelthe :tool-support-is Operating i'n a given lplane/;-

23.1In1; a machine for. cuttin bevel-gears,

the .combination with the wor {-support'for centering a gear-blank on a given axis, a toolcarrier'mounted'to rotate on an. axis intersecting that of the' gear-blank and the toolto rotate about an aXis which intersects the aXesof-the carrierzand the gear-blank, :of any` arm formed concentrcally to the aXis of the carrier and :mounted to rotate about the' aXis of the .'gear-blank as-a center, an operative connection :between the said arm and the tool-support which is capable of transmitting 'motion between these parts while they oper- 1 ateabout'l .their respective-axes, and devices operatively connecting the said arm and the gear-blank support for causinoP4 a uniform motion of=the figear-'blank and the tool-support capable :of swinging in a plane'arranged atv` about their 'respective axes.

24.':P'Inz a machine .for` cutting`V bevel-gears, i

the' tool-support inounted to rotate about an HaXis arranged in angular relation to that of the' gear-blanl of an arm mountedto rotate aboutzzt'he aXis offthe gear-blank and having' an1operative connection with' the vtool-sup- ;port while'the' latteris'operating about its aXis,a gear -operatively connected to thev gear-blank support and the rack operatively connected to the said arm and coperating 'with the said'gear, for transmitting motion between thetool-support and the gear-blanl` 251 lnf a machine for cutting bevel-gears, the-combination With: a work-support for centering the gear-blank and a tool-support adapted tocarry a tool and inounted to ro- 'tate lin va pl ane which is arranged at an angle `to'the'plane of rotation of the gear-blank, of an' arm operatively connected to the toolsupport and'mounted concentrically with the Igear-blank, a rack mounted. to move longitu- -dinally .in ways and operatively vconnected to -the' said arm` and a gear operatively connected to .thefgear-blank support and coperating thecombination 'with a work-support for f Vcenteringa gear-blank` on a given axis, and

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with the `rack toitransmit motion between i the tool-supportand the lgear-blank -While' they operate Vin their respective planes.

26. In a machine for generating the teeth vof bevel-gears,' the' combination with a suit- -able-support-for centering a gear-blank on its axisfanda tool-support vembodying a pair of pivotedguideways,v tool-holders mounted 'to' operateon said ways and carrying tools ar-v ranged'to'operate 'simultaneously on the op- 'posite'sides ofa gear-tooth of the blank and means7 for: securing zsaid guideways in lfixed .swinging the gear-blank and the guideways of the tool-support in their respective paths and with equal motion to generate the curves of the tooth.

27. In a machine for generating the teeth of bevel-gears, the combination with asuitable support for centering a gear-blank on its axis, and a tool-support embodying a pair of oppositely-arranged guideways mounted on a common axis and adjustable in angular relation, a device for retaining said guideways in fixed angular relation during the Cutting operation of the tools, and means for simultaneously rotating the gear-blank and the guideways on their respective axes to Simultaneously generate the curves on opposite sides of a gear-tooth. i 28. In a machine for generating the teeth of bevel-gears, the combination with a suitable support for centering a gear-blank on its axis, and a tool-support embodying a pair y of oppositely-arranged guideways independently adjustable about a common axis and adapted to swing about the said axis as a center, a device connecting the said guideways for adj listing and holding the latter in o 31. In amachine of the Character described,

fixed angnlar relations, tool-hold ers mounted to reciprocate on said. guideways and arranged to -operate simultaneously on the opposite faces of a tooth of the blank, and means for simultaneously swinging the gearblank and the guideways on their respective axes for simultaneously generating the curvcs on opposite sides of the tooth.

29. In a machine for generating the teeth of bevel-gears, the combination with a suitable support for rotatably centering a gearblank on its axis, of a tool-support embodying a pair angnlarly-arranged gnideways monnted on a common axis, an arm connect-` ing the said ways for holding them in fixed y'relation, an Operating-arm `'having' ways form'ed therein, a block secured to said connecting-arm'having a part coperating with the ways in said Operating-arm, and operative connections between the said Operatingarm and the gear-blank for causing simultaneous swinging movement to the gear-blank and the tools on their respective axes.

30. In a machine of the Character described, the combination with a work-su port, of a tool-support embodyingopposite y-arranged guideways which are mounted on a common axis, a tool-holder mounted to reciprocate longitudinally of each guideway, a segmental 'arm formed concentrically with the axis of the guideways and adapted to coperate with the correspondingly-formed ends of the latter, means for securing the vuideways to the said arm in fixed angular reIation during the `Cutting operation of the tools, and means cooperating with the said arm to swing the guideways bodily about their common axes.

the combination with a work-su port, of a tool-support embodying opposite -arranged guideways which are capable of being ladjusted in angular relation and each being provided with a tool-holder whichismounted vto reciprocate longitudinally thereon, an arm formed to coperate with the guideways and provided with a securing device for locking z the said guideways in fixed angular relation and an adj usting device coperating with the said guideways for varying the angular rela- -tion thereof, embodying separate screws attached to the respective guideways anda nut Operating on the screws.

32. In a machine of the Character described, the combination with a supporting-base and a work-support mounted thereon, of a carrier mounted to rotate `on the supportingand having an Operating-arm, a tool-support mounted on the carrier provided With operating-tools, an arm pivoted on a relativel fixed part and operatively connected Wit thev said Operating-arm and a camfor operating the pivoted arm to rotate the carrier relatively to the work-sup ort.

base in angular relation to the work-support 33. In a machine of the c aracter described, i

the combination with a supporting-base and a work-support mounted thereon, of a car-l rier mounted to rotate on said ;base having an Operating-arm, a tool-support mounted on the carrier, a pivoted arm mounted on a relatively fixed `part of the base, a cam for Operating the pivoted arm through a constant angle and a device connecting the said pivoted arm and arm which is capable of being adjusted to 'vary the angle of motion which is imparted to the carrier. n

34. In a machine of the Character described, the combination with a supporting-base and a .work-support mounted thereon, of a carrier mounted to rotate onthe base and having a radial arm, a tool-support on the carrier, an arm having a relatively fixed pivot, a cam for Operating the pivoted arm through a given angle and a connection between the said pivoted and Operating arms of the `carrier which is capable of adjustment to vary the i angle through which the carrier rotates. i

35. In a machine' of the Character described, the ,combination With a'supporting-base and a work-support mounted thereon, of a toolcarrier mounted to rotate in angular relation to the work-support and having an Operatingarm provided with a radially-arranged guideway, a tool-support movable with .the carrier, an arm mounted to operate about a relatively fixed pivot, a device for Operating i the pivoted arm through a given angle and a radially-adjustable projection carried by the pivoted and movable `longitudinally of the radial guideway of the Operating-arm for rotating the carrier to advance and retract the -tool relatively to the work-support.

36. |Ina machine of the Character described,

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